/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM; if not, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

\*---------------------------------------------------------------------------*/

#include "SphereDrag.H"

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

template <class CloudType>
Foam::SphereDrag<CloudType>::SphereDrag
(
    const dictionary& dict,
    CloudType& owner
)
:
    DragModel<CloudType>(dict, owner)
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

template <class CloudType>
Foam::SphereDrag<CloudType>::~SphereDrag()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template <class CloudType>
bool Foam::SphereDrag<CloudType>::active() const
{
    return true;
}


template <class CloudType>
Foam::scalar Foam::SphereDrag<CloudType>::Cd(const scalar Re) const
{
    scalar Cd;
    if (Re < SMALL)
    {
        Cd = GREAT;
    }
    else if (Re > 1000.0)
    {
        Cd =  0.424;
    }
    else
    {
        Cd = 24.0/Re*(1.0 + 1.0/6.0*pow(Re, 2.0/3.0));
    }

    return Cd;
}


// ************************************************************************* //
